Ivan Baldry, Liverpool JMU; Unveiling the Mass Function The Stellar to Baryonic Mass Function of Galaxies: from SDSS to GAMA with ASKAP Ivan Baldry (Liverpool JMU) SDSS: Sloan Digital Sky Survey GAMA: Galaxy And Mass Assembly survey ASKAP: Australian Square Kilometer Array Pathfinder
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The Stellar to Baryonic Mass Function of Galaxies: from ... · Ivan Baldry, Liverpool JMU; Unveiling the Mass Function The Stellar to Baryonic Mass Function of Galaxies: from SDSS
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Ivan Baldry, Liverpool JMU; Unveiling the Mass Function
The Stellar to Baryonic MassFunction of Galaxies: from SDSS
to GAMA with ASKAP
Ivan Baldry (Liverpool JMU)
SDSS: Sloan Digital Sky SurveyGAMA: Galaxy And Mass Assembly surveyASKAP: Australian Square Kilometer Array Pathfinder
Ivan Baldry, Liverpool JMU; Unveiling the Mass Function
Credits
• BGD08 paper (IB, K. Glazebrook, S. Driver)• GAMA team (SD, IB, S. Bamford, A.
Hopkins, J. Liske, J. Loveday, P. Norberg, J.Peacock … )– see http://www.eso.org/~jliske/gama/ for full
team list• ASKAP-DINGO project (M. Meyer, L.
Staveley-Smith [UWA] … )
Ivan Baldry, Liverpool JMU; Unveiling the Mass Function
The stellar mass density• Assuming Ωb=0.045, H0=70, then Ωs/Ωb =
– 4 to 8% (BGD08), 3 to 7% (Gallazzi et al. 2007)• Uncertainties/considerations:
– IMF, priors, SP model, dust treatment– definition (remaining versus formed stellar mass)– corrections to galaxy total magnitudes– volume corrections, cosmic variance
Ivan Baldry, Liverpool JMU; Unveiling the Mass Function
A solution for the sub-structure problem?
Benson, Frenk, Lacey, Baugh & Cole 2002
“Photo-ionization suppresses the formation of smallgalaxies, so that surviving satellites are preferentially thosethat formed before the universe re-ionized [at z~6-10].”
… applies tofield galaxiesas well.
Ivan Baldry, Liverpool JMU; Unveiling the Mass Function
Ivan Baldry, Liverpool JMU; Unveiling the Mass FunctionIB et al in prep.
Ivan Baldry, Liverpool JMU; Unveiling the Mass Function
Halo mass function:using group finder,velocity dispersions,mock catalogues.
Figure by P. Norberg
PREDICTED
Ivan Baldry, Liverpool JMU; Unveiling the Mass Function
Preliminary GSMF
Figure by S. Driver
Ivan Baldry, Liverpool JMU; Unveiling the Mass Function
Results from 88839redshifts - projectedto complete 120K
n(z) for GAMA survey: next two slides focus on z<0.03 shownby red box.
Ivan Baldry, Liverpool JMU; Unveiling the Mass Function
Low-mass galaxies from mag-limited z surveys
SDSS r<17.8
GAMA r<19.8
centi-L* galaxies
milli-L* galaxies
Ivan Baldry, Liverpool JMU; Unveiling the Mass Function
Cyan oval shows objects consistent with being high-SB end of the low-L galaxy distribution.Yellow oval shows objects that are possibly star clusters or nucleated cores of galaxies.
Ivan Baldry, Liverpool JMU; Unveiling the Mass Function